Răspuns:
Explicație:CH3-COOH acid etanoic
Masa molara=12×2+4×1×16×2=24+4+32=60g/mol
60g.............32gO
100..............x
x=100×32/60=320÷60=53,3%
C6H5-NH2 fenil amina
Masa molara=12×6+7×1+14=72+21=93g/mol
93g....................14gN
46,5...................x
x=46,5 ×14/93=7gN